Tungsten

Tungsten — refractory silver-gray metal with atomic number 74 in periodic table.

General characteristics

Metallic tungsten is obtained from ore concentrates by reduction to appearance of metal powder of WO3 trioxide at 700 °C. In this case, tungsten receives such characteristics:

• Melting point 3422 °C;
• Boiling point 5555 °C;
• Inherent paramagnetism in metal (magnetism susceptibility 0,32⋅10−9);
• Hardness becomes 488 kg/mm² according to Brinell;
• Heaviest, hardest and refractory alloy;
• Forged and processed at 1600 °C.

In metallurgical industry, tungsten is produced in form of powders, ingots, plates and other types.

Application area

Most tungsten is used as basis for creation of other refractory alloys. In addition, it is also used for:

• Lighting devices, picture tubes and other vacuum tubes;
• Military industry;
• Electrodes for argon-arc welding;
• Surgical devices;
• Aviation;
• Tanks for radioactive materials;
• Heating elements for vacuum furnaces;
• Engineering, etc.

In addition, metal is also used as component for solid-phase nuclear engines.

Steel grades

Here are few tungsten alloys that are widely used:

Carbides:

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